"What" and "How"

Someone said: "I feel responsible only for what I say, not for what you understand". It sounds right, doesn't it? But it may also be not totally true. How come that I say something and you understand something else? Don't words have the same meaning for everyone? Actually, they don't. The same word, phrase or sentence may be interpreted in different ways, according to how they are uttered, the intonation they are accompanied by, the context in which they are used. It also depends on the situation, the mood, the  expression and body language. Can you see how important it is to be aware of how you speak? Of what you say? Of how you say it? Instead of simply speaking your mind, also think about who is listening and, if necessary, make some adjustments. In this way many misunderstandings could be  avoided.